Nope, you're screwed. Especially if you live in Germany. Your IP is branded as "Deutsche Zensur Aktiviert". You can buy a British or otherwise foreign copy of the game and use it on your account, that should work. But once you see the "funny" censored version, it's over.

I've been trying to get HL1 uncensored, because I accidentally bought a German version of it. No luck. You can run a "mod" with different content in your game folder. But no chance to run it in multiplayer.

That being said, I wouldn't be surprised if there was a working patch out there. All I can tell you is that, since the wonderful wonders of big brother Steam, anti-censorship patches are becoming a pain in the ass.

I would imagine setting steam's language to US english and using a proxy from USA when downloading the games would get you the Gore version. Find out the method they use to decide who to give the kindergarten version to and you can trick it before ever getting the game.

grüß